Optional parameters referring to previous parameters?

[Mehrdad]

On Thursday, 10 May 2012 at 17:07:49 UTC, Tove wrote:
> On Thursday, 10 May 2012 at 15:51:08 UTC, Steven Schveighoffer 
> wrote:
>> On Thu, 10 May 2012 11:48:25 -0400, Steven Schveighoffer 
>> <schveiguy at yahoo.com> wrote:
>>
>> And BTW, it's not just sugar -- you are saving a function call 
>> and unnecessary code space.
>>
>> -Steve
>
> ui, pretty please! I love it too, it would allow this marvelous 
> construct!
>
> auto my_extended_alloca(size_t size, void* buf=alloca(size))
> {
>   return buf;
> }

lol, that's exactly why I asked for this..